Valve



' Oct. 27, 1936. H, v HANSEN 2,058,868

VALVE Filed May 19, 1933 Patented Oct. 27, 1936 UNITED STATEE PATENTFECE 1 Claim.

The invention relates to valves and its primary object is to provide animproved valve of the type in which the casing is provided with a bottomopening therein, and such opening is closed 5 by means of a cap whichhas a cylindrical upstanding sleeve for slidably supporting a valveplunger and clamping a ring-shaped valve seat against the bottom face ofa substantially horizontally extending passage equipped cross-wall inthe casing.

Other objects of the invention and the various advantages andcharacteristics of the present Valve construction will be apparent froma consideration of the following detailed description.

The invention consists in the several novel features which arehereinafter set forth and are more particularly defined by the claim atthe conclusion hereof.

In the drawing which accompanies and forms a part of this specificationor disclosure and in which like numerals of reference denotecorresponding parts throughout the several views, Figure 1 is a sectionof a valve embodying the invention. Fig. 2 is a fragmentary perspectiveof the removable cap and valve seat. Fig. 3 is a fra mentary perspectiveof the various parts of the valve plunger. Fig. 4 is a section on line4& of Fig. 1. Fig. 5 is a section illustrating a modified form of theinvention.

The invention is exemplified in a valve which comprises a casing 6 andhas particular utility in connection with the control or regulation ofthe fiow of fluid to a compressor in a refrigerating system. The casing6 is provided at one side with an inlet passage l and has an outletpassage 8 at the outer side thereof. A wall or partition 9 extendsacross the interior of the casing 6 and is formed with a passage lthrough which fluid is adapted to pass when the valve is open. Thebottom of the casing is provided with an opening H to provide access tothe interior of the valve casing. This opening is closed by a cap l2which is removably secured by any suitable means, such as screws l3, tothe valve casing. A packing ring I4 is interposed between the valvecasing and a flange l on the cap. The cap is provided with a cylindricalsleeve it, the upper end of which terminates adjacent to the wall 9 inthe casing. An inwardly extending and upwardly facing annular shoulder His formed near the upper end of the sleeve it to engage a ring l8 whichforms a removable valve seat. This ring is preferably formed of suitableelastic material and fits between the shoulder l1 and the lower face ofthe wall 9 around the passage in in said Wall. The sleeve 16 is providedwith a flange as which fits around the ring Hi. When the cap 62 issecured in place with respect to the casing by the screws I3, the ringI8 is firmly clamped between the shoulder l! on the sleeve l6 and thewall 9. When the cap is removed from the casing the seat forming ring l8comes with it. The lower face of the wall 9 is machined as at 9 so thatwhen the ring l8 is jammed against it a fiuidproof joint is formed bythe ring between the sleeve it of the cap and said wall. An annulargroove 20 is formed in the inner periphery of the upper end of thesleeve I6. Openings 29 are formed in the sleeve It to permit fiuid topass from the inlet 1 into the groove and through the ring i8 andpassage lil in wall 9. A cylindrical screen 2| is fitted around theoutside of the sleeve 56 and seated on a shoulder 22. The upper ends ofthe flange l9 and screen 2i terminate slightly below the top face of theseat-forming ring it so there will be no interference with the jammingof the ring l8 into its operative position between the shoulder 22 andwall 9. A cylindrical plunger 23 slides in a cylinder 2% in the sleeveit of the cap, and a valve-member 25'of any suitable material is securedon the top of the plunger by a stem 26 the lower end of which is screwthreaded, as at 21, into the plunger and is provided with a shoulder 28for removably securing the valve member 25 on the plunger. The plunger23 is held normally closed by a spring 29 which engages the lower end ofthe plunger and has its lower end confined in a recess in a screw plug3%} in the central portion of the lower end of the cap 52. The upperface of the valve member 25 is adapted to seat on the under face of theseat-forming ring E8 to cut off communication between the inlet andoutlet passages in the casing. The margin of the valve member 25 isadapted to lap the bottom face of the ring H3 inwardly of the annularshoulder IT in the sleeve l6.

Whenever it becomes necessary to examine or replace the ring l8, it isonly necessary to remove the screws 13 so the cap and all of the partscarried thereby including the ring It, the plunger 23 and the stem 26can be withdrawn through the opening ll from the casing. By virtue ofthe fact that the ring I8 is unattached to the Wall El and removablefrom the cap it is possible readily to replace the ring whenever itbecomes worn. The valve member 25 can also be readily replaced after thecap has been removed from the casing by disconnecting the stem 26 fromthe plunger 23.

Normally the plunger is held closed by the spring 29. The fluid underpressure in the passage l flows through the screen and the openings 20in the sleeve E6 of the cap l2 into the annular groove 20 in said sleeveand around the valve member 25. The pressure of the cap against theseat-forming ring i8 effectively seals the joint between the ring andthe wall 9 and the pressure of the fluid and the plunger 23 against theunderside of said ring tends to keep the seal tight, in order to directthe fluid upwardly from the groove 20 and thence through theseat-forming ring I8. The sleeve is provided on the inner peripherythereof and directly above the groove with an upwardly tapered face.This face is approximately of the same diameter as the valve member 25and in addition to directing the fluid upwards through the seat-formingring it serves to guide the valve member 25 into seated relation withthe ring it! when the valve plunger is shifted upwards in the sleeve.

The valve comprises improved mechanism for opening the plunger 23 byfluid under pressure to control or regulate the flow of fluid throughthe valve. This mechanism comprises a casing 30*, the lower end of whichhas a pair of legs 30*. The latter terminate in a ring 36 which issecured by a nut 31 on the top of the valve casing 6. A diaphragm 32 isclamped between the body of the casing 38 and a head 33 which is securedto said body by bolts 34. A pipe 35 is connected to the top of the head33 to supply fluid under pressure into the chamber above the diaphragmto flex the diaphragm downwardly when the valve is to be opened. Aplunger 36 engages the lower face of the diaphragm and is pressedthereagainst by a spring 31 which is held in the casing 30 A stem 38 onthe lower end of the plunger 36 is slidably mounted in a plug 39 whichis screw-threaded into the casing M A stud 40 is screw-threaded to thestem 38 so that it can be adjusted. A stem M is slidably mounted in theupper part of the valve casing 6 and its lower end is adapted to engagethe upper end of the stem 26 of the plunger 23. A bellows 42 has aflange clamped to the casing 6 by a collar 43 to form a seal around thestem 4 i.

In order to impart to the plunger-valve a longer stroke than the rangeof movement or the diaphragm to control more accurately the movements ofthe valve responsively to variations in the pressure of the fluid actingon the diaphragm a device is interposed between the stud 40 and the stem4|. This device consists of a lever 44 which has its outer end fulcrumedon a pin 45 in one of the legs 30 of the casing 30 and a lever 41 whichhas its outer end fulcrumed on a pin 48 in the other leg of the casing.The stud 40 engages the lever 44 at an intermediate point. The inner endof lever 41 engages the stem 4! and the inner end of the lever 44 has anabutment 49 which engages the lever 41 between its fulcrum and its innerend. As a result, the movement of the stud 40 is applied to the lever 44so that the abutment 49 will have a greater movement than the stud 4Gand the diaphragm and this abutment is applied to the lever 47 betweenits fulcrum and the point of its engagement with the stem 4! so that themovement of the inner end of the lever 41 and stem 4| will be greaterthan the movement of the abutment 49. This exemplifies a device betweenthe diaphragm operated stud and the stern for shifting the plunger 23for multiplying the movement imparted by the diaphragm to the plunger23.

A series of holes 50 are formed in and adjacent the outer end of thelever 44 so the lever can be adjusted to vary the distance between theabutment 49 and the point of engagement of the stud 40 to vary thestroke imparted to the stem 4! relatively to the stroke of thediaphragm. The lever 44 is recessed as at 44 to receive the lever 41.

In the modification shown in Fig. 5 the plunger 23 is slidably mountedin an inner cap [6 which has a screw thread Ifi for engaging a femalethread in the casing 6 so that it can be turned to force the removablevalve seat l8 against the Wall 9 of the casing. An outer cap it is screwthreaded to the portion of the thread Ni which projects beyond thecasing. The outer cap it seats on a face on the casing to preventleakage around the screw threads. A spring 29 for forcing the plungeragainst the seat Ic is applied between the lower end of said plunger andthe outer cap I6 The invention is not to be understood as restricted tothe particular details set forth, since these may be modified within thescope of the appended claim, without departing from the spirit and scopeof the invention.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent, is:

In a valve of the character described, the combination of an open ended,horizontally extending casing having an opening in its bottom andprovided with a substantially horizontal, crosswall serving to form afluid inlet compartment in the lower portion of the casing and a fluidoutlet compartment in the upper portion of said casing and embodying acentral passage therein between the two compartments, a cap for closingthe opening in the casing bottom secured removably to the casing, asleeve formed integrally with, and extending upwardly from, the cap andhaving on its upper end and directly beneath the bottom face of thecentral portion of the cross-wall with a flat, annular face and a flangearound the face, said sleeve being provided beneath the seat and in theinner periphery thereof with an annular groove and having side openingsleading to the groove for permitting fluid in the lower compartment topass into the groove and thence upwards through the passage into theupper com-- partment, and also having an upwardly tapered face directlyabove the groove and beneath said annular face for directing the fluidupwards from the groove and through the aforesaid passage, a ring-shapedvalve seat confined within the flange and having the outer marginal partthereof clamped between the flat face of the sleeve and the bottom faceof said central portion of the cross-wall, a valve plunger slidablevertically in the sleeve and having a separately formed member ofelastic material secured to its upper end and adapted when the plungeris raised to be guided by said tapered face into engagement with theinner marginal part of the ring-shaped seat and to close the passageagainst flow of fluid from the lower compartment to the uppercompartment, and means for shifting the plunger downwards with respectto the sleeve in order to open the passage for the flow of fluidtherethrough. HERBERT HANSEN.

